Uokawa Y, Yonezawa Y, Caldwell W M, Hahn A W
Dept. of Electronics Engineering, Hiroshima Institute of Technology, Japan.
Biomed Sci Instrum. 2000;36:373-7.
A data acquisition system employing a low power 8 bit microcomputer has been developed for heart rate variability monitoring before, during and after bathing. The system consists of three integral chest electrodes, two temperature sensors, an instrumentation amplifier, a low power 8-bit single chip microcomputer (SMC) and a 4 MB compact flash memory (CFM). The ECG from the electrodes is converted to an 8-bit digital format at a 1 ms rate by an A/D converter in the SMC. Both signals from the body and ambient temperature sensors are converted to an 8-bit digital format every 1 second. These data are stored by the CFM. The system is powered by a rechargeable 3.6 V lithium battery. The 4 x 11 x 1 cm system is encapsulated in epoxy and silicone, yielding a total volume of 44 cc. The weight is 100 g.
已开发出一种采用低功耗8位微型计算机的数据采集系统，用于监测沐浴前、沐浴期间和沐浴后的心率变异性。该系统由三个一体式胸部电极、两个温度传感器、一个仪表放大器、一个低功耗8位单片机（SMC）和一个4MB的紧凑型闪存（CFM）组成。电极采集的心电图由SMC中的A/D转换器以1ms的速率转换为8位数字格式。来自身体和环境温度传感器的信号每1秒都转换为8位数字格式。这些数据由CFM存储。该系统由可充电的3.6V锂电池供电。这个4×11×1厘米的系统用环氧树脂和硅胶封装，总体积为44立方厘米，重量为100克。
